Three different types of chambers are used for VOC emissions testing. The smallest, referred to as microchambers, allow relatively fast emissions measurements and have two volumes, 44 mL and 114 mL. These chambers can be operated at temperatures up to 120 °C for the smaller volumes and 250 °C for the larger, which can be used to accelerate the emissions process for some compounds. Two mid-size chambers, with volumes of 53 L, are used to test small samples of building materials under tightly controlled temperature, humidity and airflow conditions. A room size chamber is also available for testing emissions from full-size pieces of furniture.